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DJ530 last won the day on April 20 2020

DJ530 had the most liked content!

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About DJ530

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  • Location Redding, CA, USA

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  1. DJ530


  2. More recent pic of the updated $30 steering wheel, with quick release I had lying around the shop. The stock steering wheel was like some Fisher Price thing. Not ideal at full clip on the trail lol
  3. Here is a pic of the custom header I made myself, by modifying the golf cart header, just shorted it up, welded it all back up and using the same cheapy muffler, still loud as heck though. Debating a bigger quiet muffler. Quite a challenge basically doubling the power output in these buggies and the tuning needed to make it work, about the same as any other rig. If I had more time for it, I would put larger disc brakes and a power steering rack in it, with better shocks. But it does what we need it to, a little too fast at times, if the trails are a bit bumpy. Not as smooth as the Gator we
  4. Just to note, we noticed an oil leak on the 670 on the flywheel side, the frame would get wet with oil. Upon inspection it was just the oil vapor breather tube came loose and was weeping oil. I thought maybe it blew a seal out since we run it around 4000-4500 rpm most of the time. That's the only issue I have had with the new engine.
  5. It's doing great, far better than I expected even. I haven't really done anything to it for the past three months, except drive it. I was worried we would break the Predator engine, but it takes everything we can throw at it. The engine I replaced was a Robin/Subaru EH63. I am running the same CVTech powerbloc clutch, just with a slightly lighter spring , I believe it is the 400/700 spring. Had to go with a lighter spring as the extra torque of the 670 engine over revved (was annoying) a bit at wide open throttle, the lighter spring holds it around 4000-4500, vs 5000-5500 with the original spr
  6. Thanks Vaughn. No surprise, but I had never even heard of them until I stumbled upon this one on a facebook marketplace ad, if it weren't so cheap I probably would have passed on it. Glad I did, we have a blast with it, (the wife and family have a ball in it) it is a lot of fun out on the trails, climbs anything we point it at, hauls a half ton with no issue and cruises on the road 45MPH @ 4000rpm - and as simple as a lawn mower to work on. For all around utility, this one is a hit for us. We have tried to blow it up a few times, but nothing has fazed it yet!
  7. -----First my required disclaimer: Don't try this at home!! ----- Now with that out of the way: Here is a 'drivability profile diagram' (Reference: Olav Aaen''s vey informative Clutch Tuning Handbook for the scoop on the math behind all this - or this link: https://web.wpi.edu/Pubs/E-project/Available/E-project-022014-185837/unrestricted/MQP_Timothy_DeGreenia_Edited_Jan19.pdf ) Just to give an idea of the empirical 'shift out' with the CVTech in 7:1 mode, just subtract 10MPH from the numbers shown in this graph. (this graph shows the gear ratio 10.15:1 we are using which
  8. A quick peak into the guts of the mysterious Dana H-12 rear end in these things, built pretty stout for a 'golf cart/lawn mower' axle!
  9. Update on the swap. Since getting the new engine spun up, and dialing in the Mikuni, we have been putting this buggy to use! After a good snow storm, it proved to be handy to have to go clear broken branches and fallen trees in the area. and on our property. I could tell right away though something wasn't quite right with the CVT, it would 'shift out' and the motor would just wind out (as in 5K+ RPM) too high in other words at an anemic 20 MPH tops. Once all the work was done I learned all about this CVT setup. Here is what I learned, and this should apply to all CVTech PWB50/80 type CVT
  10. She's a runner! Waiting on some special tools to get here as I have some tuning to do on the clutch. Clutch stalls the motor a bit high, so I have a feeling it's all caked with mud in the clutch sliders. Runs good though!
  11. Getting it back together. Engine final mockup and assembly done. Needed to bump the engine to the passenger side about 1/2" to line the CVT up inline with the original location on the old engine. The 670 has a longer crank snout where the pulley seats. Just waiting on some parts for the carb (this setup uses a 1.5mm needle and seat for use with a pulse pump), and the moto carb to stock throttle arm cable,- should be here tomorrow - and we are ready to fire. Starter cranks, all wired up. I only ended up with a kill wire for now, (blue wire from UTV, black/red wire on the motor) , and the st
  12. Thanks Travis! No, this new motor hasn't been fired, lubed everything up well, greased the cam lobes, checked the bearing clearances, will delete the governor arm and mechanism and button it up. Couple more pics.
  13. A few pictures (so far) of the engine work - eventually I will share wiring info and other details (if anyone is interested?) should anyone else ever need to swap an engine in one of these. The replacement engine is a Harbor freight $750 special 670cc, (lawn mower/industrial type lump) with a few minor upgrades. Should have it back together soon, bolted in. The cold weather slows me down!
  14. Thanks! Haven't taken it apart yet. I was going to prime the oil pump before first before first fire up. I have some parts on the way so I can run a mikuni flatslide carb I have. The stock carb will be too lean apparently.
  15. Fitting the legos back together.

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